Public bug reported:

Find the update log attached (dpkg.log)

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.15.0-118.119~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-118-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2.24
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  pascal     2210 F.... pulseaudio
CurrentDesktop: Unity
Date: Wed Sep 23 15:32:02 2020
InstallationDate: Installed on 2018-01-11 (986 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_DevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  pascal     2210 F.... pulseaudio
Symptom_Jack: Black Headphone Out, Left
Symptom_Type: No sound at all
Title: [UX430UQ, Realtek ALC295, Black Headphone Out, Left] No sound at all
UpgradeStatus: Upgraded to xenial on 2018-09-20 (734 days ago)
dmi.bios.date: 07/05/2017
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: UX430UQ.302
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: UX430UQ
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrUX430UQ.302:bd07/05/2017:svnASUSTeKCOMPUTERINC.:pnUX430UQ:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX430UQ:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.family: UX
dmi.product.name: UX430UQ
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

** Attachment added: "update log_23_09_20.txt"
   
https://bugs.launchpad.net/bugs/1896774/+attachment/5413513/+files/update%20log_23_09_20.txt

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https://bugs.launchpad.net/bugs/1896774

Title:
  Headphone output stopped working after perfoming dist-upgrade

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